/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.util;

import java.io.Serializable;

@SuppressWarnings("serial")
public class BytesComparator implements java.util.Comparator<byte[]>, Serializable {
  @Override
  public int compare(byte[] o1, byte[] o2) {
    return compare(o1, 0, o1.length, o2, 0, o2.length);
  }

  public static int compare(byte[] lhs, int lbegin, int llen,
                            byte[] rhs, int rbegin, int rlen) {
    int len = Math.min(llen, rlen);
    int lindex = lbegin;
    int rindex = rbegin;
    for (int i = 0; i < len; i++) {
      int l = lhs[lindex++] & 0xFF;
      int r = rhs[rindex++] & 0xFF;
      if (l < r) return -1;
      if (l > r) return  1;
    }
    if (llen < rlen) return -1;
    if (llen > rlen) return  1;

    return 0;

  }
}
